Classic Sudoku 13
A classic sudoku is a grid that contains nine rows and nine columns, i.e. 81 squares in total.
The goal of the game is to fill the squares with the numbers from 1 to 9 so that each number occurs only once on the same row, in the same column or in the same subgrid (box of 9 squares).
PDF file (2 pages)
Solutions for both grids are included.